Feasibility of phosphonium-based ionic liquids as solvents for extractive desulfurization of liquid fuels

Omar U. Ahmed; Farouq S. Mjalli; Ashish M. Gujarathi; Talal Al-Wahaibi; Yahya Al-Wahaibi; Inas M. AlNashef

doi:10.1016/j.fluid.2015.05.015

Feasibility of phosphonium-based ionic liquids as solvents for extractive desulfurization of liquid fuels

Omar U. Ahmed, Farouq S. Mjalli^*, Ashish M. Gujarathi, Talal Al-Wahaibi, Yahya Al-Wahaibi, Inas M. AlNashef

^*Corresponding author for this work

Petroleum and Chemical Engineering

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

Binary solid-liquid equilibria for phosphonium based ionic liquids with dibenzothiophene (DBT) were measured within the temperature range of 303.15-353.15K. The influence of temperature and ionic liquid structure on solubility of dibenzothiophene is presented. The solubility of DBT in all tested ionic liquids increased with temperature and as high as 52.93wt% DBT in solution was obtained at 353.15K. At this temperature, the solubility of DBT in ILs based on the trihexyl(tetradecyl)phosphonium cation depends on the anion of the IL. This dependency was found to be in the order; Cl^->Br^-≈N(CN)₂^->[NTf₂]^-> bis(2,4,4-trimethylpentyl)phosphinate. The experimental solubility data was satisfactorily correlated using NRTL thermodynamic model. Finally, more than 99% (DBT) and 96% (thiophene) sulfur removal were achieved after 4th and 5th extraction stages respectively using the triisobutyl(methyl) phosphonium tosylate ionic liquid under mild operating conditions.

Original language	English
Pages (from-to)	102-109
Number of pages	8
Journal	Fluid Phase Equilibria
Volume	401
DOIs	https://doi.org/10.1016/j.fluid.2015.05.015
Publication status	Published - Sept 5 2015

Keywords

Dibenzothiophene
Ionic liquids
NRTL
Phosphonium
Solubility
Thiophene

ASJC Scopus subject areas

General Chemical Engineering
General Physics and Astronomy
Physical and Theoretical Chemistry

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title = "Feasibility of phosphonium-based ionic liquids as solvents for extractive desulfurization of liquid fuels",

abstract = "Binary solid-liquid equilibria for phosphonium based ionic liquids with dibenzothiophene (DBT) were measured within the temperature range of 303.15-353.15K. The influence of temperature and ionic liquid structure on solubility of dibenzothiophene is presented. The solubility of DBT in all tested ionic liquids increased with temperature and as high as 52.93wt% DBT in solution was obtained at 353.15K. At this temperature, the solubility of DBT in ILs based on the trihexyl(tetradecyl)phosphonium cation depends on the anion of the IL. This dependency was found to be in the order; Cl->Br-≈N(CN)2->[NTf2]-> bis(2,4,4-trimethylpentyl)phosphinate. The experimental solubility data was satisfactorily correlated using NRTL thermodynamic model. Finally, more than 99% (DBT) and 96% (thiophene) sulfur removal were achieved after 4th and 5th extraction stages respectively using the triisobutyl(methyl) phosphonium tosylate ionic liquid under mild operating conditions.",

keywords = "Dibenzothiophene, Ionic liquids, NRTL, Phosphonium, Solubility, Thiophene",

author = "Ahmed, {Omar U.} and Mjalli, {Farouq S.} and Gujarathi, {Ashish M.} and Talal Al-Wahaibi and Yahya Al-Wahaibi and AlNashef, {Inas M.}",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2015",

month = sep,

day = "5",

doi = "10.1016/j.fluid.2015.05.015",

language = "English",

volume = "401",

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T1 - Feasibility of phosphonium-based ionic liquids as solvents for extractive desulfurization of liquid fuels

AU - Ahmed, Omar U.

AU - Mjalli, Farouq S.

AU - Gujarathi, Ashish M.

AU - Al-Wahaibi, Talal

AU - Al-Wahaibi, Yahya

AU - AlNashef, Inas M.

PY - 2015/9/5

Y1 - 2015/9/5

N2 - Binary solid-liquid equilibria for phosphonium based ionic liquids with dibenzothiophene (DBT) were measured within the temperature range of 303.15-353.15K. The influence of temperature and ionic liquid structure on solubility of dibenzothiophene is presented. The solubility of DBT in all tested ionic liquids increased with temperature and as high as 52.93wt% DBT in solution was obtained at 353.15K. At this temperature, the solubility of DBT in ILs based on the trihexyl(tetradecyl)phosphonium cation depends on the anion of the IL. This dependency was found to be in the order; Cl->Br-≈N(CN)2->[NTf2]-> bis(2,4,4-trimethylpentyl)phosphinate. The experimental solubility data was satisfactorily correlated using NRTL thermodynamic model. Finally, more than 99% (DBT) and 96% (thiophene) sulfur removal were achieved after 4th and 5th extraction stages respectively using the triisobutyl(methyl) phosphonium tosylate ionic liquid under mild operating conditions.

AB - Binary solid-liquid equilibria for phosphonium based ionic liquids with dibenzothiophene (DBT) were measured within the temperature range of 303.15-353.15K. The influence of temperature and ionic liquid structure on solubility of dibenzothiophene is presented. The solubility of DBT in all tested ionic liquids increased with temperature and as high as 52.93wt% DBT in solution was obtained at 353.15K. At this temperature, the solubility of DBT in ILs based on the trihexyl(tetradecyl)phosphonium cation depends on the anion of the IL. This dependency was found to be in the order; Cl->Br-≈N(CN)2->[NTf2]-> bis(2,4,4-trimethylpentyl)phosphinate. The experimental solubility data was satisfactorily correlated using NRTL thermodynamic model. Finally, more than 99% (DBT) and 96% (thiophene) sulfur removal were achieved after 4th and 5th extraction stages respectively using the triisobutyl(methyl) phosphonium tosylate ionic liquid under mild operating conditions.

KW - Dibenzothiophene

KW - Ionic liquids

KW - NRTL

KW - Phosphonium

KW - Solubility

KW - Thiophene

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JO - Fluid Phase Equilibria

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ER -

Feasibility of phosphonium-based ionic liquids as solvents for extractive desulfurization of liquid fuels

Abstract

Keywords

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